Relief-valve.



Nrrnn TATES ATENT union.

IIAAKON S. RINGI, OF CHICAGO HEIGHTS, ILLINOIS, ASSIGNOR TO THE AMERICANCOTTON COMPANY, OF NEW YORK, N. Y.

RELI EF-VALVE.

SPECIFICATION forming part of Letters Patent No. 639,435, dated December19, 1899. Application filed February 7, 1899. Serial No. 704,799. (Nomodel.)

1'0 (Ll Z whom it may concern.-

Be it known that I, HAAKON S. RINGI, a citizen of the United States,residing at Chicago Heights, in the county of Cook and State ofIllinois, have invented certain new and useful Improvements inRelief-Valves, of which the following is a specification.

My invention relates to various new and useful improvements inrelief-valves; and the object of the invention is toprovide a valve ofsimple construction and wherein pressure of a liquid, gas, or vapor maybe relieved within very close limits.

The invention is particularly designed for securing a substantiallyuniform pressure in an almost closed hydraulic system, provision beingmade with the valve to vary such pres sure as may be desired.

In order that my invention may be better understood, attention isdirected to the accompanying drawing, forming part of thisspecification, and in which is shown a vertical sectional view of myimprovedrelief-valve The generally cylindrical casing 1 of the valve isprovided with an entrance-opening 2 and an exit-opening 3, which areconnected in any suitable way with the inlet and exhaust pipes.

4 is a removable cap screwed tightly upon the upper end of the casing 1.A plunger 5 is mounted in said cap and carries apackingdisk 6 at itslower end, which cooperates with a seat 7 to open and close theinlet-bore 2. The plunger 5 may be packed with a light gasket 8,although this is not necessary, since in ordinary use the exit-piperelieves any pressure in the interior of the chamber 1. The lower end ofthe plunger 5 carries a tube 9, having a screw-thread shank 10 engagingsaid plunger and holding the packing-disk 6 in place. The said tube 9fits more or less loosely in the bore 2 and is provided with a verticalpassage 11 and the connecting horizontal passages 12 immediately belowthe packing-disk 6. Pressure on the plunger 5 is secured from a lever13, having an adjustable weight 14 thereon. Said lever is fulcrumed on astandard made integral with a My device, it will be noted, is simple andV compact and can be built at low cost. Its operation is as follows:

The pressure of the fluid within the bore 2 when excessive forces thefluid through the passages 11 and 12 of the tube 9 and around theoutside of said tube, the escape being be tween the tube 9 and bore 2and beneath the packing-disk 6 and seat 7. The escape of the fluid liftsthe plunger 5 against the weight 14., allowing for the escape of thefluid, and

reduces the pressure in the bore 2 until the weight 14 prevents furtherescape by forcing the packing-disk 6 on the seat 7. By allowing foravery contracted passage for the fluid in its escape I secure a devicewhereby the pressure will be relieved within very close limits. In caseof a very sudden increase in pressure the elevation of the plunger 5 maybe sufficient to connect the passage 12 with the interior of the casing1, so as to effect a very quick relief; but under ordinary conditions,where the increase in pressure is very gradual, the escape of the fluidis effected only in minute quantities. For this reason it may bepossible in certain instances to make the tube 9 solid, the escape ofthe fluid being permitted only around the exterior thereof.

Having'now described my invention, what I claim as new, and desire tosecure by Letters Patent, is as follows:

1. In a relief-valve, the combination with a hollow casing having aninlet and an outlet opening, of a seat for the inlet-opening, aloosely-fitting plunger engaging said seat, a tube carried by saidplunger and entering said inlet-opening, and a passage connecting thebore of said tube with its exterior, substantially as set forth.

2. In a relief-valve, the combination with a casing 1, of aninlet-opening 2 therein, a seat 7 for said opening, a cap I for thecasing, a plunger mounted in said cap, a packing-disk This specificationsigned and witnessed this 3d day of February, 1899.

I-IAAKON S. RINGI.

on said plunger engaging said seat, a tube carried by the plunger andmounted in the inlet-opening, aring removably secured to the casing, aWeighted lever pivoted to said ring and engaging the plunger, and aguide for Witnesses:

said lever carried by said ring, substantially MAGNUS SWENSON,

as set forth. 1 E. FEWSON.

